Jose Aguiniga passes out

LAS VEGAS -- The main event of Golden Boy Promotions' Fox Sports Net/Fox Deportes card Friday night was canceled Thursday when Jose Aguiniga passed out while trying to make the 130-pound weight limit and was taken to the hospital for observation, according to Nevada State Athletic Commission executive director Keith Kizer.

Aguiniga (33-0, 15 KOs), of Oxnard, Calif., was due to face Francisco Vargas (15-0-1, 12 KOs) of Mexico in a scheduled 10-round junior lightweight contest at The Cosmopolitan.

When Aguiniga passed out and had to be taken to the hospital, "That was it for us," Kizer said. "Golden Boy tried to find a last-minute sub to fight Vargas but there just wasn't enough time."

"Aguiniga fainted at the gym, and he was rushed to the hospital," Golden Boy matchmaker Eric Gomez said. "He's fine now. They put an IV in. He had severe dehydration. He's fine now, but he can't fight."

The card (11 p.m. ET) will go on with the junior welterweight bout between San Diego's Antonio Orozco (16-0, 12 KOs) against Jose Reynoso (16-4-1, 3 KOs) of Riverside, Calif., moving into the main-event slot and being increased from a scheduled eight-round bout to a 10-round fight.

In the eight-round co-feature, super middleweight Anthony Dirrell (24-0, 21 KOs) of Flint, Mich., the younger brother of former super middleweight title challenger and 2004 Olympic bronze medalist Andre Dirrell, will face Houston's Don Mouton (11-6-1, 9 KOs).

The show will also feature a pair of 2012 U.S. Olympians in six-round bouts: junior middleweight Errol Spence Jr. (4-0, 3 KOs) of Dallas and junior featherweight Joseph Diaz Jr. (3-0, 1 KO) of South El Monte, Calif. Spence will face Brandon Hoskin (16-4-1, 8 KOs), and Diaz will face Eric Gotay (3-1, 1 KO).